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Pachycrommium clarki
Taxonomy
Amaurellina (Euspirocrommium) clarki was named by Stewart (1927) [DISTRIBUTION: Early Eocene; California, Mexico.]. Its type specimen is UCMP 31385, a shell, and it is a 3D body fossil.
It was recombined as Amaurellina clarki by Gardner and Bowles (1934); it was recombined as Pachycrommium clarki by Marincovich (1977), Squires (1984), Squires (1987), Squires (1988), Squires and Demetrion (1992), Squires (1999), Perrilliat et al. (2006).
It was recombined as Amaurellina clarki by Gardner and Bowles (1934); it was recombined as Pachycrommium clarki by Marincovich (1977), Squires (1984), Squires (1987), Squires (1988), Squires and Demetrion (1992), Squires (1999), Perrilliat et al. (2006).
Sister species lacking formal opinion data
Entered
by A. Hendy on 2008-03-27; modified by J. Marcot on 2025-06-26
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1927 | Amaurellina (Euspirocrommium) clarki Stewart pp. 336-338 figs. pl. 26, figs. 8, 9 |
| 1934 | Amaurellina clarki Gardner and Bowles p. 246 |
| 1938 | Amaurellina (Euspirocrommium) clarki Turner p. 86 |
| 1939 | Amaurellina multiangulata Vokes p. 174 figs. plate 22, fig. 2, 8, 13 |
| 1977 | Pachycrommium clarki Marincovich p. 238 |
| 1984 | Pachycrommium clarki Squires p. 24 figs. Figure 7e |
| 1987 | Pachycrommium clarki Squires p. 36 fig. 44 |
| 1988 | Pachycrommium clarki Squires p. 12 fig. 25 |
| 1992 | Pachycrommium clarki Squires and Demetrion p. 32 |
| 1999 | Pachycrommium clarki Squires p. 18 figs. Figures 35, 36 |
| 2006 | Pachycrommium clarki Perrilliat et al. p. 159 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Pachycrommium clarki Stewart 1927
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Invalid names: Amaurellina multiangulata Vokes 1939 [synonym]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: superf = superfamily, c = class | |||||
| References: Hendy et al. 2009, Kiessling 2004 | |||||
Age range: base of the Early/Lower Eocene to the top of the Lutetian or 56.00000 to 41.03000 Ma
Collections (80 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Eocene | USA (California) | Pachycrommium clarki (111552) | |
| Ypresian | Mexico (Baja California) | Pachycrommium clarki (5499) | |
| Ypresian | USA (Washington) | Pachycrommium clarki (146900) | |
| Ypresian | USA (Oregon) | Amaurellina clarki (200795 200800 200804) Pachycrommium clarki (52304 52305) | |
| Ypresian | USA (California) | Amaurellina clarki (167604) Pachycrommium clarki (178748 178749 185192 193542 193544 193545 193547 193548 207305 207315 207325 207326) | |
| Ypresian - Lutetian | USA (California) | Pachycrommium clarki (8011 8017 8018 200143 200144 205252) | |
| Eocene | USA (California) | Amaurellina clarki (194436) | |
| Eocene | USA (Oregon) | Amaurellina clarki (200899) | |
| Lutetian | Mexico (Chiapas) | Pachycrommium clarki (79943) | |
| Lutetian | USA (California) | Amaurellina clarki (166460 176675 176677 194413 194414) Pachycrommium clarki (5540 5541 5542 5543 8012 8013 16712 94822 94825 178733 178777 200838 200842 200845 200846 200852 201192 201203 201259 201691 201693 201695 201697 201700 201701 201702 205257 207144 207148 207149 207157 207158 207162 207172 207175 207176 207179 207187 207188) | |
| Lutetian | USA (Oregon) | Amaurellina clarki (201033 201041) | |
| Middle Eocene | USA (California) | Pachycrommium clarki (194431 202078 202085) | |
| Middle Eocene - Late/Upper Eocene | USA (California) | Amaurellina clarki (37928) |